Part 1 of 2. A Cirque du Soleil cast member discovers a woman's dead body during a performance, and Grissom and Catherine investigate. Meanwhile, an investor in one of Sam Braun's new casinos is shot to death during a party on a rooftop. Later, Catherine's life is placed in jeopardy after visiting a nightclub with Nick, and Grissom finds a miniature replica of a crime scene he is investigating. John Mayer appears as himself.

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Conclusion. Grissom investigates the murder of an aging rock star (Danny Bonaduce) who is found dead in his kitchen near an exact replica of the crime scene. The probe reveals that the victim was stalling on a business deal that could reap millions for his family. Meanwhile, Catherine probes her own abduction and learns that someone may be targeting her family.

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Five corpses tell their bloody tales to each other in the coroner's office cooler. In the first story, Catherine investigates the murder of a woman who is found nude in a hotel's service elevator. Next, Warrick probes the death of a hiker who apparently fell off a cliff. The strange thing is that her brain is missing. In the third tale, a former marine is stabbed to death at a gas station. Lastly, Grissom and Sara investigate the deaths of two men who were killed with a chainsaw.

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Two people are viciously beaten, one of them fatally, just five blocks apart in a shady part of town. As the CSIs investigate, more beatings are reported nearby, one of which is witnessed by Greg. His decision to intervene leads to extreme consequences. Later, another similar assault occurs in a different part of town and the CSIs must determine whether it is related to their cases or not. Cole: Kevin Federline.

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A woman is found crucified on a makeshift cross in a Catholic church that's being renovated in a run-down part of town. The investigation reveals the victim was a singer in a local club and that she may have known the priest at the church. The body is discovered by two nuns, one of whom loathes the priest, while the other worships him.

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Two boys are reported missing and a pedophile who lives in their neighborhood becomes the primary suspect after he is injured in a house fire, apparently set by a local seeking revenge for the boys' disappearance. The investigation reveals that one of the boys lives with a rough grandfather who doesn't seem too worried that his grandson is missing.

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After a woman dying of cancer is murdered in her home, the killer later returns to leave a miniature exact replica of the crime scene. It's similar to the one found at the murder scene of a slain rock star weeks before, indicating that a serial killer is at work. In court, Greg testifies at an inquest held to determine his culpability in the death of a teenager he accidentally killed.

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Identical twin sisters who apparently didn't know of each other's existence are murdered on the same night. One is gunned down outside of a dry cleaners and the other one is hung with a dog leash inside her home. The question facing the CSIs is whether the two crimes are connected or are coincidental. Also, Grissom is invited to take part in a seminar at Brown University, which would require him to take a sabbatical.

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The remains of Mickey Dunn, a wanted Las Vegas mobster who disappeared in the mid 1970s, are fished out of Lake Mead with a bullet hole in the head. Soon afterwards, a wheelchair-bound man is murdered and a photo found on his body shows the victim with Dunn and three other men. Dunn and the victim have Xs on their faces. It quickly becomes apparent that the other three men may also be targets. Roger Daltrey guest stars.

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Grissom investigates when a worker at a poultry processing plant is found dead in a stun bath used to electrocute chickens before they are slaughtered. Nearby, a miniature replica of the crime scene is discovered. It's eerily similar to two other replicas left at scenes of homicides. Also, a man and a dead woman are found stuck in cement at a construction site; and an elderly Russian woman is discovered dead in her apartment with her head in a gas stove, but Warrick thinks she was murdered.

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Catherine testifies in a murder trial in which a man is accused of murdering his own mother three years ago, but the suspect is found not guilty. Catherine, however, believes he did commit the crime and that he may also have killed two other people, so she sets out to find the other victims. Catherine's probe leads to a small Nevada town where an elderly woman and her daughter were fatally stabbed and shot three years earlier. Back at the lab, Grissom prepares to leave on a four-week sabbatical.

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Catherine investigates the murder of a runaway teen whose naked body is found in a desert lot behind a hotel. Helping with the case is Mike Keppler (Liev Schreiber), an experienced CSI from Baltimore who is the newest hire on the day shift but is filling in temporarily on the night shift since Grissom is on sabbatical. Their investigation reveals the dead girl may be the victim of a serial killer whose slayings may go back decades.

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Keppler persuades Catherine to help him fake a crime scene and deceive their colleagues in a controversial plan to catch the West Coast's biggest illegal drug supplier, who is the leading suspect in the murder of an anti-drug assemblyman who was gunned down in the desert. Keppler concocts the plan when the suspect disappears and his trail grows cold after several weeks.

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The charred body of an ex-con who was recently released from prison is found in a burned welding shack. The investigation reveals the victim's body was raided for bones, veins, tendons and other tissues. Across town, the bloody body of a millionaire's wife is found in her plush home. She was beaten to death with a champagne bottle. Her husband claims he found her after returning home early from a business trip.

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Keppler is put into a compromising position when the bodies of a Trenton police officer and a hooker are found in a hotel room. The man who found them is a retired New Jersey cop and close friend to Keppler, who doesn't reveal their relationship or that he also knew the dead man. The victims were shot to death and the left hand of the woman was cut off. Back at the lab, Grissom returns from his sabbatical and learns about the friction caused by Keppler while he was away.

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Grissom is shocked when he opens a package sent to him through the mail and finds a miniature crime scene inside. The discovery is all the more baffling since the serial killer responsible for other similar miniatures is now dead. The probe reveals the murder depicted has yet to take place but is likely to occur soon, so Grissom works to analyze the miniature and find the real location.

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A popular high-school basketball player and his cheerleader girlfriend disappear after a big Friday-night game. Blood is found near a field house where the two hooked up after the contest and where things apparently got out of control. The investigation reveals a male cheerleader is in love with the missing girl and may know more than he is saying.

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Six showgirls are murdered in their rented house and Sara is haunted by the dying words of the last victim. The investigation reveals the women's necks were slashed with a knife and that Warrick believes he knows one of the victims. Also, Greg gets some disturbing information from Grissom about the civil suit filed against him.

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Hodges convinces fellow lab rats Archie, Henry, Mandy and Wendy that Grissom wants them to secretly investigate the so-called miniature murders while the CSIs are in the field probing other crimes. Meanwhile, Grissom and Dr. Robbins chase a rat in the morgue after it escapes from inside of a corpse during an autopsy of a drowning victim found in Lake Mead.

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A blackjack dealer is murdered and several of the suspects belong to a strange UFO club whose members believe that shape-shifting aliens have mated with humans in order to conquer the human race. Shannon: Ally Sheedy. DeVere: Enrico Colantoni. Clarissa: Julie Hagerty.

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Grissom investigates when a sadistic client tries to murder Lady Heather (Melinda Clarke) during a late-night rendezvous at an old West theme park. The probe is made more difficult when Heather refuses to name her attacker. Also, Grissom's reunion with Lady Heather makes Sara uneasy. Across town, Warrick and Nick investigate the death of a pickpocket who was apparently struck by a car.